Writing instruments are composed of water-based inks

The reducing particle dispersion balances oxygen reduction and corrosion prevention with sustained effects and stability, addressing the limitations of existing technologies by using a polymer-encapsulated reducing agent and preservative system.

TWI934035BActive Publication Date: 2026-08-01MITSUBISHI PENCIL CO LTD
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Patent Information

Application Number
TW111135711
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-11-12
Filing Date
2022-09-21
Publication Date
2026-08-01
Estimated Expiration
2042-09-20

AI Technical Summary

Technical Problem

Existing oxygen absorbers and reducing agents suffer from issues such as poor sustainability, dispersion instability, and adverse effects on other components in aqueous liquids, lacking inherent preservative properties, and are not suitable for use in liquids like household hygiene products.

Method used

A reducing particle dispersion characterized by a polymer with a specific structural unit and reducing components dispersed in water, encapsulating reducing agents like polyphenols and preservatives, which balances oxygen reduction and corrosion prevention while maintaining stability and slow-release properties.

Benefits of technology

The dispersion achieves high oxygen absorption capacity, corrosion prevention, and excellent dispersion stability without affecting other components, with sustained effects and broad antibacterial spectrum.

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Abstract

A reducing particle dispersion is provided, which highly balances oxygen reduction performance (oxygen absorption capacity) and corrosion prevention performance. Moreover, while possessing its continuity (slow-release properties), it does not adversely affect other admixtures and exhibits excellent dispersion stability. The reducing particle dispersion disclosed herein can be exemplified by a polymer having at least one structural unit represented by the following general formula (I) as the main body, and for example, reducing particles containing at least one reducing component selected from group A below dispersed in water. [In the above formula (I), R is an alkyl group with 2 to 8 carbon atoms]. Group A: Polyphenols, copper chlorophyll, flavonoids, anthocyanins, butylated hydroxytoluene, butylated hydroxyanisole. In addition to reducing components, the aforementioned reducing particles are preferably also containing preservative components.
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